Updates for (post) Robolectric 2.0 alpha 3.

Views must have a non-null context.
ListViews must have a height in order for children to be rendered.
Switched from a custom RobolectricTestRunner subclass to using TestLifecycleApplication.
Merge pull request #12 from xian/master

Updates for Robolectric 2.0-alpha-4-SNAPSHOT.